<template>
    <div id="TypeNav">
        <div class="type-nav">
            <div class="container" @mouseenter="isShow = true" @mouseleave="hideCategorys">
                <h2 class="all">全部商品分类</h2>
                <nav class="nav">
                    <a href="###">服装城</a>
                    <a href="###">美妆馆</a>
                    <a href="###">尚品汇超市</a>
                    <a href="###">全球购</a>
                    <a href="###">闪购</a>
                    <a href="###">团购</a>
                    <a href="###">有趣</a>
                    <a href="###">秒杀</a>
                </nav>
                <div class="sort" v-show="isShow">
                    <div class="all-sort-list2" @click="goSearch">
                        <div class="item bo" v-for="(c1, index) in categoryList" :key="c1.categoryId"
                            @mouseenter="showCategorys(index)" :class="{ 'item-on': index === currentIndex }">
                            <h3>
                                <a :data-categoryName="c1.categoryName" :data-category1id="c1.categoryId">{{
                                    c1.categoryName }}</a>
                            </h3>
                            <div class="item-list clearfix">
                                <div class="subitem" v-for="(c2) in c1.categoryChild" :key="c2.categoryId">
                                    <dl class="fore">
                                        <dt>
                                            <a :data-categoryName="c2.categoryName" :data-category2id="c2.categoryId">{{
                                                c2.categoryName }}</a>
                                        </dt>
                                        <dd>
                                            <em v-for="(c3) in c2.categoryChild" :key="c3.categoryId">
                                                <a :data-categoryName="c3.categoryName"
                                                    :data-category3id="c3.categoryId">{{ c3.categoryName }}</a>
                                            </em>
                                        </dd>
                                    </dl>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { mapState } from 'vuex'
import throtttle from 'loadsh/throttle'
export default {
    name: 'TypeNav',
    data() {
        return {
            currentIndex: -1,
            isShow: false
        }
    },
    mounted() {
        // 请求的路径为根路径则显示一级分类列表
        this.isShow = this.$route.path === '/home';

        // 到App.vue中发送请求，减少服务器负载
        // 发送异步请求，获取一级分类列表
        // this.$store.dispatch('getCategoryList')
    },
    computed: {
        ...mapState({
            categoryList: (state) => {
                return state.Home.categoryList;
            }
        })
    },
    methods: {
        // 使用节流的方式显示三级分类列表
        showCategorys: throtttle(function (idx) {
            this.currentIndex = idx;
        }, 200),
        // 隐藏三级分类列表
        hideCategorys() {
            this.currentIndex = -1;
            if (this.$route.path !== '/home') {
                this.isShow = false;
            }
        },
        // 
        goSearch(e) {
            const { categoryname, category1id, category2id, category3id } = e.target.dataset;
            if (categoryname) {
                //准备query参数
                const query = { categoryName: categoryname }
                if (category1id) {
                    query.category1Id = category1id
                } else if (category2id) {
                    query.category2Id = category2id
                } else if (category3id) {
                    query.category3Id = category3id
                }
                //跳转到搜索路由,携带准备的query参数
                let location = {name: "search"};
                location.query = query;
                if(this.$route.params) {
                    location.params = this.$route.params;
                }
                this.$router.push(location)
            }
        }
    }
}
</script>

<style lang="less" scoped>
.type-nav {
    border-bottom: 2px solid #e1251b;

    .container {
        width: 1200px;
        margin: 0 auto;
        display: flex;
        position: relative;

        .all {
            width: 210px;
            height: 45px;
            background-color: #e1251b;
            line-height: 45px;
            text-align: center;
            color: #fff;
            font-size: 14px;
            font-weight: bold;
        }

        .nav {
            a {
                height: 45px;
                margin: 0 22px;
                line-height: 45px;
                font-size: 16px;
                color: #333;
            }
        }

        .sort {
            position: absolute;
            left: 0;
            top: 45px;
            width: 210px;
            height: 461px;
            position: absolute;
            background: #fafafa;
            z-index: 999;

            .all-sort-list2 {
                height: 450px;
                overflow: hidden;

                .item {
                    h3 {
                        line-height: 30px;
                        font-size: 14px;
                        font-weight: 400;
                        overflow: hidden;
                        padding: 0 20px;
                        margin: 0;

                        a {
                            color: #333;
                        }
                    }

                    .item-list {
                        display: none;
                        position: absolute;
                        width: 734px;
                        min-height: 460px;
                        background: #f7f7f7;
                        left: 210px;
                        border: 1px solid #ddd;
                        top: 0;
                        z-index: 9999 !important;

                        .subitem {
                            float: left;
                            width: 650px;
                            padding: 0 4px 0 8px;

                            dl {
                                border-top: 1px solid #eee;
                                padding: 6px 0;
                                overflow: hidden;
                                zoom: 1;

                                &.fore {
                                    border-top: 0;
                                }

                                dt {
                                    float: left;
                                    width: 54px;
                                    line-height: 22px;
                                    text-align: right;
                                    padding: 3px 6px 0 0;
                                    font-weight: 700;
                                }

                                dd {
                                    float: left;
                                    width: 415px;
                                    padding: 3px 0 0;
                                    overflow: hidden;

                                    em {
                                        float: left;
                                        height: 14px;
                                        line-height: 14px;
                                        padding: 0 8px;
                                        margin-top: 5px;
                                        border-left: 1px solid #ccc;
                                    }
                                }
                            }
                        }
                    }

                    &:hover {
                        .item-list {
                            display: block;
                        }
                    }

                }

                .item-on {
                    background-color: skyblue;
                }
            }
        }
    }
}
</style>